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If you have a concrete subfloor, you must secure the carpet padding with adhesive or glue. However, if you have a wooden subfloor, use staples instead. Removing a glued-down carpet can be difficult and time-consuming, so it’s best to avoid glue when possible.

In most cases, you do not need to put padding or underlayment under carpet tiles. Unlike traditional carpet, which requires a separate pad, carpet tiles are designed to be installed directly onto a firm subfloor like plywood, concrete, or tile. Many carpet tiles come with a built-in underlay and attach with peel-and-stick adhesive, double-sided carpet tape, or glue. For a more comfortable, cushioned feel, especially in residential settings, you can opt for padded carpet tiles that have a thicker underlay attached. While it's generally not recommended to install a separate pad, a compact underlayment might be used in some situations, though this typically requires professional installation. An acoustic underlay may also be considered in commercial spaces or multi-level homes where noise reduction is a priority.

Carpet density refers to how closely together the fibers of a carpet are stitched into the carpet backing, with values ranging from 1,000 to 7,000. A carpet density value of 3,000 or higher is considered best for most homes, especially in high-traffic areas, such as a living room or dining room. If you’re comparing two carpets made of the same material, a higher carpet density can indicate better durability and longevity. However, carpet density is only one of many factors that can help you determine a carpet’s quality.

The cost to install carpet is $1,780 on average for 330 square feet, the size of an average living room. This cost could range from $200 to $5,000, depending on the amount of carpet, material, and type of carpet. 

If you need 500 square feet of carpet, it’ll cost $1,500 to $5,500, while 1,000 square feet of carpet costs $3,000 to $11,000. Polyester is one of the more affordable options, ranging from $1 to $3 per square foot. Wool is a more luxurious option, ranging from $4 to $20 per square foot.